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首页> 外文学位 >The Silver Spring and Blackrock faults, east-central Nevada: Kinematics, timing, and role of low-angle normal faulting in the development of Railroad Valley.
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The Silver Spring and Blackrock faults, east-central Nevada: Kinematics, timing, and role of low-angle normal faulting in the development of Railroad Valley.

机译：内华达州中东部的银泉断层和黑石断层：运动学，时间以及低角度正断层在铁路谷发展中的作用。

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摘要

The structural development of Railroad Valley, a large and economically important Tertiary basin in east-central Nevada, has been the focus of much debate. This study addresses many of the points of controversy through a detailed geologic study of structures in the southwestern White Pine Range.; Detailed geologic mapping and construction of cross-sections reveal both low- and high-angle normal faults. The low-angle faults consist of three bedding-parallel faults, two top-to-the-southwest and one top-to-the-south, and two large displacement (>8 km heave) (26,000 ft) top-to-the-west detachments that denude a range-scale Mesozoic fold. Two spatially distinct groups of high-angle normal faults are present: (1) mostly synchronous faults in the hanging wall of the large-displacement detachments that developed in 3-D strain above non-planar footwalls; and (2) faults within the footwalls of the large-displacement detachments that indicate a counterclockwise rotation in extension direction from east-west to northwest-southeast though time.; A structural model is proposed for the southwestern White Pine Range where extension and uplift of the range begins in the Oligocene along low-angle faults, and in the Late Miocene, shifts to high-angle normal faulting. A regional comparison of geometries, kinematics, and timing of major detachment faults suggests that Railroad Valley developed as a result of several distinct structural systems, some of which are separated by transverse faults.
机译：内华达州中东部一个大型的，具有重要经济意义的第三纪盆地-铁路谷的结构发展一直是许多争论的焦点。本研究通过对西南白松山脉构造的详细地质研究，解决了许多争议点。详细的地质图和横截面构造揭示了低角度和高角度的法向断层。低角度断层包括三个平行的层理断层，两个西南偏上和一个南偏上，以及两个最大位移（> 8 km升沉）（26,000 ft）西部支队剥夺了中尺度的褶皱。存在两个在空间上不同的高角度法向断层群：（1）在大位移断层的悬挂壁中大部分为同步断层，该断层以非平面底盘上方的3D应变发展。 （2）大位移分队下盘内的断层，表明沿时间方向从东西向向西北东南方向逆时针旋转。为西南白松山脉提出了一个结构模型，该范围的扩展和隆起始于渐新世沿低角度断层，而在中新世晚期则转变为高角度正断层。对主要分离断层的几何形状，运动学和时间点进行区域比较，表明铁路山谷是由几种不同的结构系统（其中一些被横向断层分开）形成的。

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  • 作者

    Knudsen, Tyler R.;

  • 作者单位

    University of Nevada, Las Vegas.;

  • 授予单位 University of Nevada, Las Vegas.;
  • 学科 Geology.
  • 学位 M.S.
  • 年度 2005
  • 页码 117 p.
  • 总页数 117
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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